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143 lines
4.1 KiB
ArmAsm
143 lines
4.1 KiB
ArmAsm
/* Vector Optimized 32/64 bit S/390 version of wmemset.
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Copyright (C) 2015-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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# include "sysdep.h"
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# include "asm-syntax.h"
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.text
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/* wchar_t *wmemset(wchar_t *dest, wchar_t wc, size_t n)
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Fill an array of wide-characters with a constant wide character
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and returns dest.
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Register usage:
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-r0=tmp
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-r1=tmp
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-r2=dest or current-pointer
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-r3=wc
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-r4=n
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-r5=tmp
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-v16=replicated wc
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-v17,v18,v19=copy of v16 for vstm
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-v31=saved dest for return
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*/
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ENTRY(__wmemset_vx)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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# if !defined __s390x__
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llgfr %r4,%r4
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# endif /* !defined __s390x__ */
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vlvgg %v31,%r2,0 /* Save destination pointer for return. */
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clgije %r4,0,.Lend
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vlvgf %v16,%r3,0 /* Generate vector with wchar_t wc. */
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vrepf %v16,%v16,0
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/* Check range of maxlen and convert to byte-count. */
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# ifdef __s390x__
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tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */
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lghi %r5,-4 /* Max byte-count is 18446744073709551612. */
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# else
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tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */
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llilf %r5,4294967292 /* Max byte-count is 4294967292. */
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# endif /* !__s390x__ */
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sllg %r4,%r4,2 /* Convert character-count to byte-count. */
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locgrne %r4,%r5 /* Use max byte-count, if bit 0/1 was one. */
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/* Align dest to 16 byte. */
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risbg %r0,%r2,60,128+63,0 /* Test if s is aligned and
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%r3 = bits 60-63 'and' 15. */
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je .Lpreloop /* If s is aligned, loop aligned. */
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tmll %r2,3 /* Test if s is 4-byte aligned? */
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jne .Lfallback /* And use common-code variant if not. */
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lghi %r1,16
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slr %r1,%r0 /* Compute byte count to load (16-x). */
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clgr %r1,%r4
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locgrh %r1,%r4 /* min (byte count, n) */
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aghik %r5,%r1,-1 /* vstl needs highest index. */
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vstl %v16,%r5,0(%r2) /* Store remaining bytes. */
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clgrje %r1,%r4,.Lend /* Return if n bytes where set. */
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slgr %r4,%r1 /* Compute remaining byte count. */
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la %r2,0(%r1,%r2)
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.Lpreloop:
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/* Now we are 16-byte aligned. */
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clgijl %r4,17,.Lremaining
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srlg %r1,%r4,8 /* Split into 256byte blocks */
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clgije %r1,0,.Lpreloop64
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vlr %v17,%v16
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vlr %v18,%v16
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vlr %v19,%v16
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.Lloop256:
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vstm %v16,%v19,0(%r2)
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vstm %v16,%v19,64(%r2)
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vstm %v16,%v19,128(%r2)
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vstm %v16,%v19,192(%r2)
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la %r2,256(%r2)
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brctg %r1,.Lloop256 /* Loop until all blocks are processed. */
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llgfr %r4,%r4
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nilf %r4,255 /* Get remaining bytes */
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je .Lend /* Skip store remaining bytes if zero. */
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.Lpreloop64:
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clgijl %r4,17,.Lremaining
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clgijl %r4,33,.Lpreloop16
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srlg %r1,%r4,5 /* Split into 32byte blocks */
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.Lloop32:
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vst %v16,0(%r2)
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vst %v16,16(%r2)
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la %r2,32(%r2)
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brctg %r1,.Lloop32 /* Loop until all blocks are processed. */
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llgfr %r4,%r4
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nilf %r4,31 /* Get remaining bytes */
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je .Lend /* Skip store remaining bytes if zero. */
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.Lpreloop16:
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clgijl %r4,17,.Lremaining
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srlg %r1,%r4,4 /* Split into 16byte blocks */
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.Lloop16:
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vst %v16,0(%r2)
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la %r2,16(%r2)
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brctg %r1,.Lloop16 /* Loop until all blocks are processed. */
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llgfr %r4,%r4
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nilf %r4,15 /* Get remaining bytes */
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je .Lend /* Skip store remaining bytes if zero. */
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.Lremaining:
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aghi %r4,-1 /* vstl needs highest index. */
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vstl %v16,%r4,0(%r2)
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.Lend:
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vlgvg %r2,%v31,0 /* Load saved dest for return value. */
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br %r14
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.Lfallback:
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srlg %r4,%r4,2 /* Convert byte-count to character-count. */
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jg __wmemset_c
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END(__wmemset_vx)
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#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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